Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.
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Viggo Bang. “First Day Cover Commemorating Niels Bohr and the 50th Anniversary of Bohr's Atom Theory.” Denmark, November 21, 1963. Witco Stamp Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2v23vt53q.
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